There are early maginal osteophytes seen along the L4 and L2 vertebral bodies. Vertebral alignment was otherwise satisfactory. Lordosis was preserved. Disc spaces were of normal height. There is a lucent line seen in the pars of interarticularis of L4. This is consistent in appearance with a Spondylolysis. No evidence of spondylolisthesis was noted. This is narrowing of the L5/S1 disc space. Rest of the disc spaces were of normal height. No other bony abnormality is noted.
Spondylolysis is a defect in the pars interarticularis of a vertebra. The great majority of cases occur in the lowest of the lumbar vertebrae (L5), but spondylosis may also occur in the other lumbar vertebrae, as well as in the thoracic vertebrae.Spondylolysis occurs in three to six percent of the population. It is typically caused by stress fracture of the bone, and is associated with certain activities, such as weight lifting and gymnastics. Spondylolysis also runs in families and is more prevalent in some populations, suggesting a hereditary component such as a tendency toward thin vertebral bone.
Although spondylolysis can affect people of any age, children and adolescents are most susceptible. This is because their spines are still developing, and the pars is the weakest part of the vertebra. Placing extra strain on this area of the spine during childhood increases the chance that a pars defect will occur.